Island



(No Model.)

W. D. BULLOCK DRAW B,RIDGE.

Patented July 21,1885.

k a j N o Q F *3 H WI .7' NZ 551 5 N, PETERS, Phnlo-Lilhvgrapher, Wiihinnnnnnn C,

PATENT A FFICE.

YVILLIAM D. BULLOCK, OF PROVIDENCE, RHODE ISLAND.

DRAW-BRIDGE.

SPECIFICATION forming part of Letters Patent No. 322,787, dated July 21,1885.

Application filed May 26, 1885. (No model.)

To all whom it may concern.-

Be it known that I, WILLIAM D. BULLOCK, of the city and county ofProvidence and State of Rhode Island, have invented a new and usefulImprovement in Draw-Bridges, of which the following is a full, clear,and exact descrip: tion, reference being had to the accompanyingdrawings, which form a part of .this specification.

My invention relates to swinging and draw bridges; and the object of myinvention is to produce an intermittent connection for operating gatesor signals upon the fixed spans by power applied from the center of thedraw.

To the above purpose my invention consists in certain peculiar and novelfeatures of construction and arrangement, as hereinafter described andclaimed, whereby signals, gates, &c., upon the fixed or shore spans areoperated directly from the center of the draw, thus avoiding allinterference or delay in the operation of the draw, and also avoidingadditional assistance in working the gates or signals and the loss oftime due to the keeper having to travel back and forth upon the draw tooperate the gates or signals.

In order that my invention may be fully understood I will proceed todescribe it with reference to the accompanying drawings, in'

which- Figure 1 is a side elevation of the meeting ends of a shore-spanand the draw with my improvement applied. Fig. 2 is an end elevation ofthe shore span with its operative attachments; Fig. 8 is a similar viewof the draw with its operative attachment In the said drawings, Adesignates the draw, and B the fixed span. Upon the outer end of thedraw A are mounted two vertical guides, 0, supported parallel with eachother by a frame, D. Upon the frame D is mounted a grooved pulley, E,over which runs a rope, F.

G designates a similar pulley mounted beneath the draw, and under whichruns the rope F. A swivel-clan1p,h, connects the lower end of rope F toa rod, H, and this rod leads to the center of the draw, at which point asuitable power or hand windlass is placed.

Upon the outer end of shore-span B are mounted two guides, I, held invertical positi on and parallel with each other by a frame, J. Kdesignates a grooved pulley, which is mounted upon frame J; and Kdesignates a similar pulley, mounted beneath the span B. A. rope, L,runs over pulley K, and a rope,

L, runs under pulley K and thence to the gate or signal upon theshore-span.

M designates a slide, which works upon guides I and in the face of whichis formed a horizontal groove, m. The lower end of rope L is attached tosaid slide, while the upper end of rope L is likewise attached to thesame. The slide M is exactly counterbalanced by a weight, V, attached tothe upper end of rope L.

N designates aslide working upon the guides G and having on its face ahorizontal tongue or rib, n, to enter groove m of slide M. The rope F isattached at its outer end to slide N.

I have not shown any form of windlass nor any gates or signals, as suchdevices may be of any suitable or preferred character.

From the above description it will be seen that when the draw is to beopened the slide N is raised by power at the center of the draw andraises slide M, thus closing the gate or operating the signal. The drawis now opened and the tongue of slide N moves freely out of the grooveof slide M. While the draw is open, the slide M is held firmly in raisedcondition by counter-weight \V, so that the gate or signal is maintainedin proper warning position. \Vhen the draw is closed, the tongue 11.enters groove m, and the weight of slide N overcomes the equilibriumbetween slide M and weight \V, so that by paying out from the Windlassthe slides will descend and the gate be opened or the signal moved backinto normal position.

It will be observed that the sides of the groove m are beveled off, sothat said groove is wider at its ends than at its center. This is tocompensate for any variations in level between the draw and shore span,in order that the tongue may always enter the groove.

Having thus described myinvention, Iclaim as new and desire to secure byLetters Patent 1. -An improved attachment for operating gates, &c., upondraw-bridges, consisting of two members engaging in the line of movementof the draw and operating together at right angles to the line ofengagement to ac tuate the gate or signal, as described.

2. The combination of a slide moving ver- ICC) tically-upon the draw, ofa slide moving similarly upon the fixed span, and connections foroperating said slides, substantially as set forth. pulleys K K, ropes LL, counter-weight WV, 3. The combination, with the draw and fixed andslide M, having groove m, as and for the 5 span, of vthe counterweightedgrooved slide purposes described.

and the tongued slide, and the connections \VILLIAM D. BULLOCK. betweenthe latter and a Windlass, as specified.

4. The combination, with the draw A, having the guides G and frame D,the pulleys E G, rope F, and slide N, having tongue n, of 10 theshore-span B, having guides 1, frame J,

WVitnesses:

JOSEPH A. MILLER, J. A. MILLER, Jr.

